"Bridge rectifier with zener B+ lowering and bias"
Posted By AneirinE on 03/26/2015
I'm building an amp with an EL84 poweramp. The PT doesn't have a CT on the high voltage secondary so I am using a bridge rectifier. The PT doesn't have a bias tap so I thought I could try the AC coupl...Discuss this entry
Posted By Alva Goldbook on 03/25/2015
I've been pondering tone stacks lately, and it rather bugs me that so many amps have used the Fender/Marshall tone stack. Because, in all honesty, it's a rather lousy circuit. The performance of the m...Discuss this entry
"Udating Ampeg Gemini II... how far can I go to keep vintage valu"
Posted By CChurchill on 03/25/2015
Firstly, I need to convert the power cord to a 3-prong earth grounded cord. I was going to just run a 3-prong through the same opening as the previous power cord. Since this modification is pretty muc...Discuss this entry
""Raffler" DC drive (mod) schematic"
Posted By proton45 on 03/24/2015
Hello all, and thanks (in advance) for any help that you can give me...
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I have used the "search feature", but I dont seem to be able to find a working link, that will take me to the "Raffler mod s...
"Converting Roberts Tape Deck to P1"
Posted By vonholt on 03/24/2015
so last summer I scored a Roberts 90c tape machine and the accompanying 901 amp. After messing with the 901 amp and studying the schematics I thought this could be a good conversion to a P1. But this ...Discuss this entry